linux-kernel - Re: ARM: relocation out of range (when loading a module)

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Date:	Wed, 12 Jan 2011 04:00:18 +0100
From:	Alexander Holler <holler@...oftware.de>
To:	Russell King - ARM Linux <linux@....linux.org.uk>
CC:	Rabin Vincent <rabin@....in>, linux-kernel@...r.kernel.org,
	linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
	Nicolas Pitre <nico@...xnic.net>
Subject: Re: ARM: relocation out of range (when loading a module)

Hello,

Am 11.01.2011 16:59, schrieb Russell King - ARM Linux:
> On Tue, Jan 11, 2011 at 09:16:38PM +0530, Rabin Vincent wrote:
>> It's possible to hack around this by placing the initramfs at the end of
>> the kernel image rather than at the beginning with the rest of the init
>> data.  Something like the below should work, although you should also
>> probably take care of alignment and also have this section freed when
>> the rest of the init data is freed.
>
> You're then running into problems as _sdata.._edata is copied to RAM on
> XIP kernels, and you really don't want to waste time copying the
> initramfs to RAM.


Thanks to all for the provided informations. I'm now seeing some light. ;)

However, looking at the vmlinux.lds.S I think I should better not try to 
fix that, I would likely do something wrong because of missing knowledge 
about all those sections.

I can offer a patch wich adds a TODO to vmlinux.lds.S, but if someone 
else feels the need to fix that, feel free to do so. ;)

Regards,

Alexander


-------------------------------------------------------------------------
 From 2ce2934b6a55ac34734781d1a49569d79d0fdcda Mon Sep 17 00:00:00 2001
From: Alexander Holler <holler@...oftware.de>
Date: Wed, 12 Jan 2011 02:49:52 +0100
Subject: [PATCH] ARM: Add TODO to move INIT_RAM_FS to another point.

Signed-off-by: Alexander Holler <holler@...oftware.de>
---
  arch/arm/kernel/vmlinux.lds.S |    6 ++++++
  1 files changed, 6 insertions(+), 0 deletions(-)

diff --git a/arch/arm/kernel/vmlinux.lds.S b/arch/arm/kernel/vmlinux.lds.S
index cead889..5da3479 100644
--- a/arch/arm/kernel/vmlinux.lds.S
+++ b/arch/arm/kernel/vmlinux.lds.S
@@ -62,6 +62,12 @@ SECTIONS
                 INIT_CALLS
                 CON_INITCALL
                 SECURITY_INITCALL
+               /*
+                * TODO: The size of INIT_RAM_FS could easily reach a
+                * point (~16MB) when loading modules will fail because
+                * relocations will be out of range. So this place here
+                * isn't the best one.
+                */
                 INIT_RAM_FS

  #ifndef CONFIG_XIP_KERNEL
-- 
1.7.3.4
-------------------------------------------------------------------------
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